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Nielsen just published a list of the top 20 Android apps used within the last month by Americans 18 and older.

The results aren't what you might expect. They tell an interesting story about how Google apps get used versus third party apps people purchase but then leave dormant on a distant home screen.

According to Nielsen, "To determine each app's “active reach,” — the percentage of Android owners who used an app within the past 30 days — Nielsen analyzed the data from on-device meters on thousands of Android smartphones."